Spirit-level.



m. .s9|,s3|. Patented Jan. 2|, I902.

' J. H. JACKSON.-

SPIRIT LEVEL.

(Application filed Apr. 25, 1900.)

(No Model and hangers rigid.

UNITED STATES- FFICE.

JOSEPH II. JACKSON, OF PITTSBURG, PENNSYLVANIA.

S PIRIT=LEVEL.

SPECIFICATION forming part of Letters Patent No.'691,631, dated January 21, 1902.

Application filed April 25, 1900. Serial No. 14,327. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH 'H. JACKSON, a citizen of the United States of America, residing at 4745 Liberty avenue, Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Spirit-Levels; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to an improved spiritlevel; and it consists of a level adapted to be attached to a line, by means of which foundations of buildings, &c. may be accurately leveled without the use of what is known in the art as a straight-edge; and the invention further consists in certain details of construction and combination of parts, as will be fully described hereinafter.

' In the accompanying drawings, Figure 1 is a side elevation of my improved level connected to a line, the same being constructed and arranged in accordance with my invention. Fig. 2 is a perspective view of the tube used for holding and protecting the glass tube of the leve1,'the same being detached from the other parts of the apparatus. Fig. 3 is an end elevation of one of the hangers, showing a means for accurately adjusting the one end of the level. Fig. 4is an end elevation of the other or opposite hanger.

To put my invention into practice,and thereby provide a level adapted to be used in connection with a cord or line, I form two hangers 2 and 3 from cast metal, the one 3 separated or divided into two sections and joined together by means of a screw 7 in a manner that the same may be lengthened or shortened to adjust one end of a level placed therein. Arranged between these two hangers 2. and 3 is a tube (see Fig. 2) having a central opening 10 and integral lugs 11, formed with openings 12, through which small screws 15 are placed as a means of attaching the said tube 9 to the hangers 2 and 3. Formed with this tube 9 are two upwardly-projecting tongues 13, which enter corresponding slots formed in the hangers and serve as a means of rendering the connection between the said tube Placed within the tube 9 is a glass tube 14, filled with spirits, showing an air-bubble, such as are common in all spirit-levels, and the said tube is adjusted to a perfect level by the hinged joint or oonnec tion '7. Each of the hangers 2 and 3 is formed with slots 4, terminating in small annular orifices 5 for the reception of the line or cord 1, and the said slots are arranged diagonally opposite the one with the other in order to prevent disengagement with the line 1 should the apparatus revolve about the same. I

In operation the level is attached to a line or cord 1, as shown at Fig. 1 of the drawings, and by stretching the line it is obvious that any level between certain points may be obtained and between points of much greater distance than obtained by a straight-edge.

Various slight modifications and changes may be made in the general construction and details without departing from the spirit of the combination of a pair of hangers, one of which is adj ustable', and each of which carries integral means for attaching to a line, a tube having integral apertured lugs extending beyond each end, means extendingthrough said lugs and engaging the hangers for securing the tube thereto, said tube carrying the spirittube and having integral tongues at its ends which project upwardly and engage with the hangers, as and for the purpose shown and described.

2. In a spirit-level, the combination, with the hangers 2, 3, the latter of which is in two adjustable sections and each of which carries integral means for securing the hangers to a line, of the tube 9 provided centrally of its upper face with a sight-opening, said tube having an integral apertured lug at each end, the lugs extending beyond the tube, and means extending through said lugs for securing the tube to the hangers, the said tube carrying the spirit-tube and having at each end an upwardly-extending tongue, said tongues engaging in slots provided therefor in the hang= ers, substantially as shown and described.

In testimony whereof I have hereunto affixed my signature in the presence of two subscribing witnesses.

JOSEPH H. JACKSON.

Witnesses:

JOHN GRoETzINeER, M. E. HARRISON. 

